From owner-freebsd-hackers Mon Mar 20 13:53: 1 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from 1Cust60.tnt4.washington.dc.da.uu.net (localhost [127.0.0.1]) by hub.freebsd.org (Postfix) with ESMTP id 7A96B37BF66; Mon, 20 Mar 2000 13:52:52 -0800 (PST) (envelope-from green@FreeBSD.org) Date: Mon, 20 Mar 2000 16:52:47 -0500 (EST) From: Brian Fundakowski Feldman X-Sender: green@green.dyndns.org To: FreeBSD MAIL Cc: freebsd-hackers@freebsd.org, freebsd-questions@freebsd.org Subject: Re: 4.0 using dd and cdroms In-Reply-To: <200003202043.KAA10576@mauibuilt.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Don't post to multiple lists; it's rude. I'll reply to both so others on -hackers won't think noone replied and reply, too. On Mon, 20 Mar 2000, FreeBSD MAIL wrote: > I have tried using dd on serveral 4.0 systems in order to capture an image off a cdrom. > > I tried dd if=/dev/acd0a of=file.img as well as on a scsi system (/dev/cd0a) and > eovery other cd device (/dev/acd0c /cdv/racd0c /dev/cd0c ect) and I get > > dd: /dev/acd0a Bad address > 0+0 records in > 0+0 records out Mode 1 CD-ROM DATA is 2352 bytes of data and ECC per block. The actual data returned from the drive is 2048 bytes, so each block is effectively 2048 bytes. Use ibs=2k or a multiple thereof. I've made a utility that does a nice job for CD duplication needs (the reading half), which you can find at: http://people.FreeBSD.org/~green/read_cd.tar.gz MD5 (read_cd.tar.gz) = 7881ea5ef1428ced7533b1cb2a3afbb1 > Thanks for any reply HTH > RP > puga@mauibuilt.com -- Brian Fundakowski Feldman \ FreeBSD: The Power to Serve! / green@FreeBSD.org `------------------------------' To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message